Keyphrases
- ir models
- information retrieval
- language model
- retrieval model
- evaluation measures
- latent semantic indexing
- vector space model
- tf idf
- xml retrieval
- probabilistic model
- term frequency
- document retrieval
- vector space
- information retrieval systems
- test collection
- retrieval systems
- n gram
- query expansion
- relevance feedback
- search engine
- learning to rank
- benchmark datasets
- information extraction